Heat the oil in a vessel. add the cumin seeds curry leaves, chilli flakes, mustard and cumin seeds garlic, ginger. Fry for about a minute, then add the onions and fry till they become brown. Add the potatoes, coriander and the green chilli. Mix well. Cover the vessel slightly. Cook over low heat, stirring occasionally until the potatoes are tender and the Potatoes are ready. Simple, isn't it!